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But wherever grass eaters travel, predators lie in wait.
但是無論草食性動物走到哪里，都有捕食者等待著他們。
Here they are, Arctic wolves.
就是他們，北極狼。
They must seize their chance while the caribou pass through their territory.
他們必須要在馴鹿經過領地時把握住機會。
The wolf runs at the herd, trying to flush out the weak or the slow.
北極狼跑向鹿群，試圖沖散群體中的弱者。
A calf is separated.
一只幼鹿走散了。
At full tilt, 40 miles an hour, the wolf is just faster.
狼全力以赴捕獵的時速將近60公里，只比小鹿快一點點。
But the calf has stamina.
但是幼鹿的耐力更好。
Only a few weeks old, and this calf's will to survive is remarkable.
雖然只有幾周大，這只幼鹿的求生欲望讓人嘆為觀止。
And it needs to be, for these young caribou have now started a journey that will last a lifetime.
而且必須如此，這些幼鹿開始了一場終其一生的旅程。
Forever chasing the seasonal growth of the grass on which they depend.
永遠追尋著他們所需要的季節性生長的青草。
Like all grassland creatures, they are at the mercy of these unpredictable but ultimately bountiful lands.
和其他草原生物一樣，他們依賴著這變化莫測而又極其慷慨的大草原。
Grass can survive some of the harshest conditions on earth, flood, fire and frost, and still flourish.
青草可以在地球上最為極端的環境下生長，經受洪水、火災和冰霜的考驗仍然生機盎然。
So it is that grasslands provide a stage for the greatest gatherings of wildlife on planet earth.
所以草原為地球上最壯觀的野生動物群提供了舞臺。
